using System;

public class Program

{

    public static void Main()

    {

        EmailAttribute attribute = new EmailAttribute("SomeValue", "%%Recipient.SomeField%%");

        Console.WriteLine("attribute = {0}", attribute);

        Console.WriteLine("attribute.Value = {0}", attribute.Value);

        Console.WriteLine("attribute.FieldName = {0}", attribute.FieldName);

        Console.WriteLine();

        attribute = "test";

        attribute.FieldName = "%%Recipient.TestField%%";

        Console.WriteLine("attribute == 'test': {0}", attribute == "test");

        Console.WriteLine("attribute == '%%Recipient.TestField%%': {0}", attribute == "%%Recipient.SomeField%%");

        Console.WriteLine("attribute = {0}", attribute);

        Console.WriteLine("attribute.Value = {0}", attribute.Value);

        Console.WriteLine("attribute.FieldName = {0}", attribute.FieldName);

    }

}

​

public class EmailAttribute

{

    public string Value { get; set; }

    public string FieldName { get; set; }

    public EmailAttribute(string value)

    {

        Value = value;

    }

    public EmailAttribute(string value, string fieldName)

    {

        Value = value;

        FieldName = fieldName;

    }   

    static public implicit operator EmailAttribute(string value)

    {

        return new EmailAttribute(value);

    }

    static public implicit operator string(EmailAttribute value)

    {

        return value.FieldName;

    }

    public static bool operator == (EmailAttribute a, string b)

    {

        return a.Value == b;

    }

    public static bool operator != (EmailAttribute a, string b)

    {

        return a.Value != b;    

    }   

    public override bool Equals(object value)

    {

        if (value is string)

            return this.Value == (string)value;

        return false;

    }

    public override string ToString()

    {

        return this.FieldName;

    }

    public override int GetHashCode()

    {

        return this.FieldName.GetHashCode();

    }

}